Isotopes

Consider the following statements $(\mathrm{X}$ and $\mathrm{Y}$ stand for two different elements$)$

$\mathrm{I}.$ $32{\mathrm{X}}^{65}$ and ${}_{33}\mathrm{Y}^{65}$ are isotopes.

$\mathrm{II}.$ $42X^{86}$ and $42Y^{85}$ are isotopes.

$\mathrm{III}.$ $85{\mathrm{X}}^{174}$ and $88{\mathrm{Y}}^{177}$ have the same number of neutrons.

$\mathrm{IV}.$ $92X^{235}$ and ${}_{94}\mathrm{Y}^{235}$ are isobars.

The correct statements are:

Isobars are atoms (nuclides) having same atomic mass number but the different atomic number.

Isotopes that emits radiation are called _____. (radioisotope / stable isotope)

Atomic weight of boron is $10.81$ and it has two isotopes  ${}_5{}^{10}\mathrm{B}$ and ${}_5{}^{11}\mathrm{B}$ in nature. What must have been the ratio of number of atoms in them?

Which radioactive isotope is typically utilized to estimate the age of fossils?

What is the relationship between the initial element $P$, which disintegrates by $\alpha$-emission, and the final element $Q$, which undergoes two subsequent disintegrations by $\beta$-emission?

The number of radioactive isotope of Hydrogen and total number of isotopes of Hydrogen are:

The atomic mass of an element is not a whole number because

${}_{12}^{24}M{g}^{2+}$

is isoelectronic with

Which of the following are isotopes?

The nuclei, which are not identical but have the same number of nucleons, are called

The set of isoelectronic species is

${}_{11}^{24}Na$ and ${}_{12}^{24}Mg$ are related to each other as
$$

Which of the following pairs represents isobars?

Which of the following statements holds good for ${}_{18}^{40}Ar, {}_{19}^{40}K$ and ${}_{20}^{40}Ca$

The reaction rates of the individual isotopes are

An element with atomic number equal to one, exists in three isotopes namely ${}_1{H}^1, {}_1{H}^2\mathrm{a}\mathrm{n}\mathrm{d} {}_1{H}^3$ . The isotope having  only one electron in its outermost shell is

The difference between the number of neutrons and the protons is positive for

The mass number $\mathrm{A}$is given by ($\mathrm{Z}$ is the atomic number and $\mathrm{N}$ is the number of neutrons)

The physical properties of the isotopes which depend on the ______ of the atoms are used to separate them.